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OI-codes/BZOJ/4653/data/20.in

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20 10
6 34
32 52
14 43
13 15
49 90
25 37
22 87
67 76
42 60
59 96
20 57
3 31
36 56
60 88
10 49
41 77
38 88
64 82
34 73
4 82